10.1: <i>Invited Paper:</i> Hyperfluorescence™; a Game Changing Technology of OLED Display

Adachi, Junji; Kakizoe, Hayato; Tsang, Ping Kuen Daniel; Endo, Ayataka

doi:10.1002/sdtp.13399

Cited by 17 publications

(17 citation statements)

References 3 publications

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“…Recently, in 2019, Endo and co‐workers from Kyulux reported upon hyperfluorescence which they claim as the “ultimate solution for OLED displays”. [ 123 ] “Hyperfluorescence” is a term that has been circulating in the world of OLEDs since 2013 and can also be found as “thermally assisted fluorescence” amongst other labels. [ 124 ] Since 2014, it is used to describe the use of TADF molecules as assistant dopants to a fluorescent emitter as reported by Adachi and co‐workers.…”

Section: Emitters For Application In Oledsmentioning

confidence: 99%

“…Five years later, the hyperfluorescent devices by Endo and co‐workers from Kyulux showed impressive performances. [ 123 ] Their blue, green, yellow, and red hyperfluorescent devices showed very narrow emission spectra, which resulted in higher color purity, significantly higher light intensities in comparison with phosphorescence and TADF‐based OLEDs and long lifetimes. Their blue device achieved a maximum EQE of 26% with an EL wavelength of 470 nm, CIE coordinates of (0.14, 0.15), and an FWHM of 31 nm.…”

Section: Emitters For Application In Oledsmentioning

confidence: 99%

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A Brief History of OLEDs—Emitter Development and Industry Milestones

et al. 2021

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Organic light‐emitting diodes (OLEDs) have come a long way ever since their first introduction in 1987 at Eastman Kodak. Today, OLEDs are especially valued in the display and lighting industry for their promising features. As one of the research fields that equally inspires and drives development in academia and industry, OLED device technology has continuously evolved over more than 30 years. OLED devices have come forward based on three generations of emitter materials relying on fluorescence (first generation), phosphorescence (second generation), and thermally activated delayed fluorescence (third generation). Furthermore, research in academia and industry toward the fourth generation of OLEDs is in progress. Excerpts from the history of green, orange‐red, and blue OLED emitter development on the side of academia and milestones achieved by key players in the industry are included in this report.

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Section: Emitters For Application In Oledsmentioning

confidence: 99%

Section: Emitters For Application In Oledsmentioning

confidence: 99%

A Brief History of OLEDs—Emitter Development and Industry Milestones

et al. 2021

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“…The fluorophores are also chosen to exhibit high radiative decay rates and narrow emission spectra; fast FRET processes contribute to shorten the overall exciton lifetimes in the device, which improves operational stability. [9][10][11][12][13][14][15][16][17][18][19] Interestingly, two-component "hyperfluorescence" layers where the TADF molecules also play the role of the host have been developed to achieve OLEDs with EQE >11%. [20][21][22][23][24] To maximize forward exciton energy transfer from the TADF molecules to the fluorescent emitters and minimize reverse energy transfer, the S 1 state of the TADF material should have a higher energy than that of the conventional fluorescent emitter (i.e., ΔE S1 > 0, as shown in Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Thermally Activated Delayed Fluorescence Sensitization for Highly Efficient Blue Fluorescent Emitters

Abroshan

Zhang

et al. 2020

Adv Funct Materials

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Hyperfluorescence is emerging as a powerful strategy to develop optoelectronic devices with high-color purity and enhanced stability. It requires appropriate integration of a sensitizer displaying efficient thermally activated delayed fluorescence (TADF) and an emitter displaying strong, narrowband fluorescence. Here, through a joint computational and experimental approach, an unprecedented, end-to-end systems level description of the electronic and optical processes that take place in a hyperfluorescent emissive layer composed of a TADF sensitizer, 2,5-bis(2,6-di(9H-carbazol-9-yl) phenyl)-1,3,4-oxadiazole (4CzDPO), and a fluorescent emitter, 2,5,8,11-tetratert-butylperylene (TBPe) is provided. The photophysical properties measurement of the emissive layer is combined with the computational determination of the electronic properties, film morphology, and excitation transfer phenomena. The Förster resonance energy transfer rates from 4CzDPO to TBPe are on the order of 10 11 s −1 , considerably higher than the radiative and nonradiative recombination rates for 4CzDPO. These features ensure nearly complete energy transfer to TBPe, leading to a five-fold increase in the photoluminescence quantum yields in the 4CzDPO:TBPe system in comparison to neat films of 4CzDPO. This approach highlights the factors that can provide efficient energy transfer from TADF molecules to fluorescent emitters, suppress energy transfer among TADF molecules, and avoid the need for a host material within the emissive layer.

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“…The detailed synthetic procedures are given in the supplementary information. The structures of all the synthesized materials were clearly characterized by 1 H and 13 C NMR and high-resolution mass spectrometry (HRMS) (Figure S13-S28).…”

Section: Materials Synthesismentioning

confidence: 99%

Achieving High Efficiency and Pure Blue Color in Hyperfluorescence Organic Light Emitting Diodes using Organo-Boron Based Emitters

Naveen

Lee

Braveenth

et al. 2021

Preprint

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In the field of organic light emitting diodes (OLEDs), organo-boron based thermally activated delayed fluorescence (TADF) emitters have reached great achievement. However, it is still challenging to achieve pure blue color (CIE y < 0.20) along with high efficiencies. To overcome these hurdles, hyperfluorescence (HF) suggest a key strategy in future OLED applications. Here, we report two TADF materials, pMDBA-DI and mMDBA-DI. Further, a pure blue multi resonance type tert-butyl substituted fluorescence emitter, t-Bu-ν-DABNA was also synthesized. Among our synthesized TADF materials based pure blue HF devices, mMDBA-DI as TADF sensitized host with t-Bu-ν-DABNA fluorescence emitter exhibited a high external quantum efficiency of 40.7% (Lambertian assumption) along with narrow emission with full width at half maximum of 19 nm (CIE y = 0.15). Moreover, we analyzed that such high device efficiency is mainly attributed to the high orientation factor, enhanced photoluminescence quantum yield, and a good TADF characteristic of t-Bu-ν-DABNA with high Förster resonance energy transfer.

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10.1: Invited Paper: Hyperfluorescence™; a Game Changing Technology of OLED Display

Abstract: Hyperfluorescence™ is the OLED emitting technology which combines thermally activated delayed fluorescence (TADF) and fluorescence, enables highly efficient and high color purity emission without using iridium. It provides ultimate solution for OLED displays.

Cited by 17 publications

References 3 publications

A Brief History of OLEDs—Emitter Development and Industry Milestones

A Brief History of OLEDs—Emitter Development and Industry Milestones

Thermally Activated Delayed Fluorescence Sensitization for Highly Efficient Blue Fluorescent Emitters

Achieving High Efficiency and Pure Blue Color in Hyperfluorescence Organic Light Emitting Diodes using Organo-Boron Based Emitters

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